Numerical Simulation of Inlet Void Fraction Affecting Oil-gas Two-phase Flow Characteristics in 90° Elbows

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-01 DOI:10.47176/jafm.17.7.2341

W. Sha, G. Leng, R. S. Xu, S. Li

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Abstract

Air can have an adverse effect on the performance of an aero-engine lubrication system. A numerical analysis was conducted to explore the influence of inlet void fraction and pipe layout on the characteristics of oil-gas two-phase flow in a 90° elbow. The pipes were arranged horizontally and vertically with inlet void fractions of 0.05-0.15. The laws governing flow velocity, void fraction, and pressure along the pipe were determined separately. The results revealed the formation of large-scale vortices with high gas volume fractions inside both types of elbows, which exacerbate oil-gas separation and cause additional head loss. The maximum pressure drop was observed at approximately one pipe diameter downstream of the elbow outlet, which initially increases with the inlet void fraction and then gradually stabilizes. Asymmetric secondary flow vortices in the horizontal elbow were found to enhance oil-gas separation and accelerate lubricating oil to greater extent than in a vertical elbow under the same conditions. Consequently, the maximum pressure drop caused by flowing through the horizontal elbow is higher than that in the vertical elbow.

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影响 90° 弯头中油气两相流特性的入口空隙率数值模拟

空气会对航空发动机润滑系统的性能产生不利影响。为了探讨入口空隙率和管道布局对 90° 弯头中油气两相流特性的影响，我们进行了数值分析。管道水平和垂直布置，入口空隙率为 0.05-0.15。分别确定了管道沿线的流速、空隙率和压力规律。结果表明，两种弯头内部都会形成气体体积分数较高的大型涡流，从而加剧油气分离并造成额外的水头损失。最大压降出现在弯头出口下游约一个管径处，最初随着入口空隙率的增加而增加，然后逐渐趋于稳定。与相同条件下的垂直弯管相比，水平弯管中的非对称二次流涡流能在更大程度上加强油气分离和加速润滑油。因此，流经水平弯管时产生的最大压降高于垂直弯管。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.